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			<h1>简单计算器</h1>
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			<span><input type="radio" name="func" checked>加法</span>
			<span><input type="radio" name="func" >减法</span>
			<span><input type="radio" name="func" >乘法</span>
			<span><input type="radio" name="func" >除法</span>
		<p class="one">数一 : <input type="text" placeholder="0" name="num"></p>
        <p class="two">数二 : <input type="text" placeholder="0" name="num"> <button>计算</button></p>
        <p class="three">结果 : <input type="text" placeholder="0" name="num"></p>
			
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